All 13 episodes of the original Carl Sagan series will air over the weekend

Get ready for billions and billions — or at least a whole lot — of episodes of “Cosmos: A Personal Voyage.”

The National Geographic channel will air a two-day marathon of the original “Cosmos” series this weekend, leading up to the premiere of Seth MacFarlane‘s reboot of the series — “Cosmos: A Spacetime Odyssey.”

Much like the groundbreaking original series, the new “Cosmos” will present the saga of how we discovered the laws of nature and found our coordinates in space and time, presenting never-before-told stories of the heroic quest for knowledge. The show aims to transport viewers to new worlds and across the universe for a vision of the cosmos on the grandest — and the smallest — scale.

Read the full schedule for National Geographic Channel’s “Cosmos” marathon below.